leach



y tuitell @Startet .cient (netting.

J. D. LEACH, OF PENOBSCOT, MAINE. SSIG NOR TO HlMSiELF, SABINHUTCHINGS,AND'SEWELL LEACH, OF SAME PLACE.

Letters-Patent No. 92,197, dated July 6, 1869.

INIPROVEMENT IN NAVIGATORS BEARING-INDICATOR.

The Schedule referred to in these Letters Patent and making part of thesama.

To all ich-om it may concern:

Be it known that I, J. D. LEAGH, of' Penobscot, in

' cator and I do hereby declare'tliat the following is a full, clear,and exact description of the construction and operation ofthe same,which, taken in connection with the drawings which accompany and makepart of this specitication, will enable those skilled in the art towhich it appertains, to make and use my invention.

This invention relates to a device by` which navigators are enabled todetermine, either by day or night, theexact bearing or direction of anylight-house, headland, or other object by which they may be shaping thecourse ot' their vessel; and

It consists in attaching to the binnacle or compasscase a revolving hubor disk, in the topot which is inserted a removable support, havingpivoted thereto, to move vertically, a tube or other device for sightingthe land-mark, while from the bottom ofthe disk two arms depend,coinciding with the sighting-tube, and which, when the tube is sightedupon the land-mark, shall indicate upon the card of thecompass thedirec- 'tion or bearing thereof.

. binnacle and b is a hub, which revolves-freely in thimble a.

c is an upright, which is inserted in hub b and l is a tube, pivoted tothe top of c, in such manner that its ends may have a rising and fallingmotion when necessary.

e is av rod, rigidly attached to hub b, and depending therefrom to anyrequired distance.

4 f j' is a semicircle, which at its -apercis firmly secured to rod e,while the ends terminate at or near the outside of the. compass c, atsuch distance therefrom as the movements ofthe compass in rough weathershall render necessary.

In tig. 3, the rod e descends to near the compasscard, when a horizontalrod or indicator, j, is pivoted thereto, in the same manner as tube d ispivoted to rod c, so that the indicator, by its own balance, shallremain parallel with the face of the compass-card, this indicator beingpeculiarly adapted to liquid-compasses.

rlhe rod c is so formed that it can only be inserted in the huh b whenthe tube d coincides iu direction with the indicators ff.

i is a disk` of rubber, which bears against the lower end of hub b, andbeneath this rubber is a metallic washer, j, while A his a screw-disk,moving upon a screw cut upon rod e, and by which to regulate the forcerequired to turn hub b, to prevent its revolving except when in use.

The tube d may be used for sighting lights in the night, and by daysights or other devices may be used for the same purpose. 4

In practice, the navigator rotates and elevates 'the tube d to suchposition as to sight the object by which he is shaping the course of hisvessel, and then, by

observing the relative positions of' indicator f and the` points`nponthe compass-card, he has pointed out thereby the exact bearing ordirectionof the landmark from theposition his ship then' occnpies,and isenabled to shape bis course. as accurately as it' steering by compassupon the ocean; whereas, by the o1'- dinary method of determining 'thebearings of landmarks, it is impossible to be more accurate than toobserve both the compass and the object, and then guess or judge as totheir relative directions.

Having thus described my invention,

What l claim as new, and desire to secure by Letters ]?atent, is f 1.Combining with a mariners compassa'mechanical device which, when sightedor brought to bear upon any object, shall indicate upon the compass-thedirection or bearing ot'such object.

2; The indicator, substantially as described and shown, and for thepurposes specified.

' J. D. LEACH.

Witnesses T. W. PORTER, HENRY Hvnu SMITH.

